Sports desk – The Union of European Football Associations has opened a formal investigation into Paris ST-Germain as part of its ‘ongoing monitoring’ of clubs under Financial Fair Play

The investigation launched after superstar Neymar was hired at the higher price for the club.

According to a BBC report, the European football’s regulator introduced FFP ‘break-even’ rules in 2013, requiring clubs to balance their spending with their revenue.

PSG more than doubled the world record transfer fee when they spent 222m euros to sign Neymar last month.

They have signed Kylian Mbappe on loan, and could pay £165.7m for him in 2018.

PSG have been owned by the Gulf state of Qatar, via its Qatar Sports Investments fund, since 2011.

The French club made a profit of 10 million euros on revenue of 520.9 million euros in the 2015-16 financial year, according to the most recent figures published by Deloitte, reported the broadcaster.

The six-time French champions have failed to meet FFP rules before – receiving a fine, a spending cap and only being allowed to register 21 players for the Champions League in 2014.

Uefa’s FFP regulations were approved in 2010 and the first assessments began the following year.

The ‘break-even’ element states clubs can spend 30m euros more than they earn over a three-year period.

A Uefa statement said the investigation into PSG would “focus on the compliance of the club with the break-even requirement, particularly in light of its recent transfer activity”.

The PSG expressed its surprise after the investigation was announced. “The club is surprised by this approach given that it has constantly kept Uefa informed about the financial impact of all players’ operations carried out this summer, even though it wasn’t obliged to do so.”

“The club is very confident in its ability to demonstrate that it will fully comply with Financial Fair Play rules for the fiscal year 2017-2018.”